March 2000
Beginner
464 pages
9h 17m
English
Content preview from Sams Teach Yourself SQL in 24 Hours, Second Edition
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Summary
You have learned about the system catalog for a relational database. The system catalog is, in a sense, a database within a database. The system catalog is essentially a database that contains all information about the database in which it resides. It is a way of maintaining the database's overall structure, tracking events and changes that occur within the database, and providing a vast pool of information necessary for overall database management. The system catalog is only used for query operations. No database user should ever make changes directly to system tables. However, changes are implicitly made each time a change is made to the database structure itself, such as the creation of a table. These entries in the system catalog ...
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